Tag: biology

Questions Related to biology

An alcoholic male develops

innate and learned behaviour option a: neurobiology and behaviour biology

  1. Impotence

  2. Early sexual maturity

  3. Increased appetite

  4. Both B and C

Show answer
Correct Option: A
Explanation:
Alcohol can cause infertility in men. It lowers the amount of testosterone which is male sex hormone. Testosterone is secreted from Leydig cells of testis. It stimulates development of secondary sex organs and sexual characters. It also promotes spermatogenesis i.e. formation of sperms from germ cells. Low levels of testosterone causes low sperm count which leads to failure in conception by females. Hence, alcohol can cause infertility or impotence in males.
So, the correct answer is 'Impotence'.

An alcoholic woman has

innate and learned behaviour option a: neurobiology and behaviour biology

  1. Reduced fertility

  2. Little menstruation

  3. Spontaneous abortion

  4. All of the above

Show answer
Correct Option: B
Explanation:
Alcohol alters the levels of oestrogen and progesterone in females. Oestrogen is the female sex hormone which regulates menstrual cycle and development of sexual characters in females. Progesterone maintains inner lining of uterus and makes it suitable for implantation. Alteration in the levels of these hormones cause irregularity in menstrual cycle. As the inner lining of uterus (endometrium) is not developed properly, little menstruation occurs because its the inner lining which sheds off and bleeding occurs.
So, the correct answer is 'Little menstruation'.

Bone part that undergoes necrosis in alcoholics is

innate and learned behaviour option a: neurobiology and behaviour biology

  1. Head of femur

  2. Shaft of femur

  3. Vertebrae

  4. Carpals

Show answer
Correct Option: A
Explanation:
Alcoholic persons suffer from a disease of necrosis of bone called osteonecrosis or avascular necrosis. It is the death of bone tissue due to which head of femur collapse. Alcohol can cause accumulation of fatty acids because it interferes with their breakdown. Accumulation of fatty acids in blood vessels can lead to decreased rate of blood supply to the bone tissue. This causes necrosis of head of femur.
So, the correct answer is 'Head of femur'. 

Sexual potency of an alcoholic person

innate and learned behaviour option a: neurobiology and behaviour biology

  1. Increases

  2. Decreases

  3. Remains unaltered

  4. Is marred by phobias

Show answer
Correct Option: B

Drinking alcohol

innate and learned behaviour option a: neurobiology and behaviour biology

  1. Stimulates muscle activity

  2. Speeds up impulse transfer

  3. Impairs coordination of different body parts

  4. Makes the driver extra careful

Show answer
Correct Option: C
Explanation:
Drinking is the addiction of alcohol which has many serious effects on body. Cerebellum of brain gets affected which causes loss of muscle coordination due to which speech becomes incoherent. Inflammation of axons occur which leads to neuritis. Alcohol acts as depressant of all body functions and all senses become dull. It removes learned behaviour and due to this, a person after drinking beaves in a uncivilised manner. 
So, the correct answer is 'Impairs coordination of different body parts'.

Alcohol

innate and learned behaviour option a: neurobiology and behaviour biology

  1. Increases reaction time

  2. Decreases reaction time

  3. Does not affect reaction but diminished decision making

  4. Both B and C

Show answer
Correct Option: A
Explanation:
Reaction time is the time taken to give response to a stimulus. Alcohol increases reaction time i.e. the body takes more time to respond to a stimulus. It affects the ability of body to react in response to a stimulus. Alcohol affects brain due to which the region of brain associated with processing of nerve signals is affected. Signals travel in brain from one neuron to other neuron. Alcohol increases the time in which a signal crosses the gap between two neurons i.e. synapse. Hence, the ability of body to interpret, perceive and responding to stimulus is greatly affected.
So, the correct answer is 'Increases reaction time'.

Syndrome found in alcohol addicts which is characterised by loss of recent and past memory without affecting normal intelligence is

innate and learned behaviour option a: neurobiology and behaviour biology

  1. Wernicke's syndrome

  2. Korsakoff's syndrome

  3. Laenec's syndrome

  4. Foetak alcohol syndrome

Show answer
Correct Option: B
Explanation:
Korsakoff's syndrome is a chronic disorder of memory that occurs due of deficiency vitamin B6 or thiamine. Deficiency of thiamine occurs due to alcoholism. This disorder doesn't affect normal intelligence, instead the memory of recent and past few minutes is affected. The person fails to remember the events that happened in the last few minutes. The person can also forget everything that happened after the onset of this disorder.
So, the correct answer is 'Korsakoff's syndrome'.

Vitamin which is most likely to become deficient in alcoholics is

innate and learned behaviour option a: neurobiology and behaviour biology

  1. Ascorbic acid

  2. Thiamine

  3. Niacin

  4. Riboflavin

Show answer
Correct Option: B
Explanation:
Alcoholic persons are dependent on consuming alcohol and there is irresistible craving for drinking alcohol. Alcohol has many serious impacts on health. Alcoholic persons suffer from anaemia. They are deficient in vitamins folic acid and thiamine (vitamin B6). Studies have shown that the deficiency of thiamine is responsible for the craving of alcohol.
So, the correct answer is 'Thiamine'.

Coffee and Tea are

innate and learned behaviour option a: neurobiology and behaviour biology

  1. Fermented beverages

  2. Alcoholic beverages

  3. Distilled beverages

  4. Non alcoholic beverages

Show answer
Correct Option: D
Explanation:
Coffee and tea are non alcoholic beverages. They are mild stimulating drinks which do not contain alcohol. Coffee and tea contain caffeine. Chemically caffeine is 1,3,7- trimethyl xanthine. It is a stimulant of CNS (Central nervous system). It is a mild diuretic and increases urine output. Tea and coffee reduce sleep and drowsiness and reduce anxiety. These beverages are addictive and withdrawal can cause muscle pain and headache.
So, the correct answer is 'Non alcoholic beverages'.

Addiction of LSD leads to

innate and learned behaviour option a: neurobiology and behaviour biology

  1. Hallucination

  2. Damage to kidneys

  3. Mental and emotional disturbance

  4. Damage of lungs

Show answer
Correct Option: C
Explanation:
LSD (Lysergic acid diethylamide) are powerful hallucinogens. They are obtained from the sclerotia of ergot fungus, Claviceps purpurea, present on rye plant. They are natural hallucinogens and change mood, behaviour and thoughts. They mimic the chemical messenger serotonin in brain. They powerful hallucinations and alter senses that result in pleasant or unpleasant sensations in the body. Thus, they can cause mental and emotional disturbance.
So, the correct answer is 'Mental and emotional disturbance'.